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        <p><strong>说明：</strong>Ubuntu配置成网关服务器。<br><a id="more"></a></p>
<h2 id="常用命令"><a href="#常用命令" class="headerlink" title="常用命令"></a>常用命令</h2><ul>
<li>使用 <code>sudo ifdown em1 &amp;&amp; sudo ifup em1</code> 重启指定的网卡。</li>
<li>使用 <code>echo &quot;密码&quot; | sudo -S apt-get install firefox gedit filezilla -y</code>  使用root密码安装多个软件并默认yes</li>
</ul>
<h2 id="配置服务器的网络连接"><a href="#配置服务器的网络连接" class="headerlink" title="配置服务器的网络连接"></a>配置服务器的网络连接</h2><ul>
<li>服务器使用iptables配置为网关，与服务器自身联网并没有必然的先后顺序。配置为网关前后，都可以完成服务器的联网。</li>
<li>【配置好网关服务器的网络设置】设置网络连接，如果使用vpn连接外网，需要设置网关是10.15.82.1，而不是其他服务器网关。修改/etc/network/interfaces，部分信息如下。</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div></pre></td><td class="code"><pre><div class="line">auto lo</div><div class="line">iface lo inet loopback</div><div class="line"></div><div class="line">auto em1</div><div class="line">iface em1 inet static</div><div class="line">address 10.15.82.63</div><div class="line">gateway 10.15.82.1</div><div class="line">netmask 255.255.255.0</div><div class="line">network 10.15.82.0</div><div class="line">broadcast 10.15.82.255</div><div class="line"></div><div class="line">dns-nameservers 10.10.0.21</div></pre></td></tr></table></figure>
<ul>
<li>【网关服务器使用vpn连接】服务器使用zju-vpn-ubuntu 进行 vpn-connect<ol>
<li>下载一个全自动vpn安装包。<a href="http://zjufiles.lifetoy.org/linux/vpn/xl2tpd_1.2.5+zju-1_i386.deb" target="_blank" rel="external">http://zjufiles.lifetoy.org/linux/vpn/xl2tpd_1.2.5+zju-1_i386.deb</a> (ftp205和org等找)</li>
<li>安装之前先删除原来的xl2tpd包。命令：<code>sudo dpkg --purge xl2tpd</code></li>
<li>安装。命令：<code>sudo dpkg -i xl2tpd_1.2.5-zju1_i386.deb</code> (根据提示或错误信息完成安装)</li>
<li>配置。命令：sudo vpn-connect -c (用户名后面一定要加@a)。</li>
<li>连接。命令：sudo vpn-connect</li>
<li>断开。命令：sudo vpn-connect -d</li>
</ol>
</li>
<li>自动连接的脚本如下所示。</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div></pre></td><td class="code"><pre><div class="line">#!/bin/bash</div><div class="line">echo &quot;&gt;&gt;&gt;&gt; disconnecting vpn &gt;&gt;&gt;&gt;&quot;</div><div class="line">sudo vpn-connect -d</div><div class="line">echo 想配置用户名密码的话，启用下一句</div><div class="line">#vpn-connect -c</div><div class="line">echo &quot;&gt;&gt;&gt;&gt; using 21326@a &gt;&gt;&gt;&gt;&quot;</div><div class="line">sudo vpn-connect</div></pre></td></tr></table></figure>
<h2 id="将服务器配置为网关"><a href="#将服务器配置为网关" class="headerlink" title="将服务器配置为网关"></a>将服务器配置为网关</h2><ul>
<li>【服务器配置为网关服务器】服务器配置为网关的基本方法为：<ul>
<li>安装iptables</li>
<li>配置iptables转发服务，作为网关</li>
<li>将iptables配置存储到文件，并设置/etc/network/interfaces自启动时加载网关配置，以实现“网关自启动”。</li>
</ul>
</li>
<li>使用下面的脚本设置iptables的规则，防止iptables清空配置的过程中无法连接服务器，运行<code>sudo ./gateway.sh</code>即可，注意相应修改。 </li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div><div class="line">35</div><div class="line">36</div><div class="line">37</div><div class="line">38</div><div class="line">39</div><div class="line">40</div><div class="line">41</div><div class="line">42</div><div class="line">43</div><div class="line">44</div><div class="line">45</div><div class="line">46</div></pre></td><td class="code"><pre><div class="line">#!/bin/bash</div><div class="line">echo gateway.sh need root access!</div><div class="line"># 注意更改为相应的网卡</div><div class="line">IFACE_LAN=em1</div><div class="line">IFACE_WAN=ppp0</div><div class="line"></div><div class="line">iptables -t nat -F   </div><div class="line">iptables -t nat -X   </div><div class="line">iptables -t nat -P PREROUTING ACCEPT   </div><div class="line">iptables -t nat -P POSTROUTING ACCEPT   </div><div class="line">iptables -t nat -P OUTPUT ACCEPT   </div><div class="line"></div><div class="line">iptables -t mangle -F   </div><div class="line">iptables -t mangle -X   </div><div class="line">iptables -t mangle -P PREROUTING ACCEPT  </div><div class="line">iptables -t mangle -P INPUT ACCEPT   </div><div class="line">iptables -t mangle -P FORWARD ACCEPT   </div><div class="line">iptables -t mangle -P OUTPUT ACCEPT   </div><div class="line">iptables -t mangle -P POSTROUTING ACCEPT  </div><div class="line"> </div><div class="line">iptables -F  </div><div class="line">iptables -X  </div><div class="line">iptables -P FORWARD ACCEPT   </div><div class="line">iptables -P INPUT ACCEPT   </div><div class="line">iptables -P OUTPUT ACCEPT  </div><div class="line"> </div><div class="line">iptables -t raw -F   </div><div class="line">iptables -t raw -X   </div><div class="line">iptables -t raw -P PREROUTING ACCEPT </div><div class="line">iptables -t raw -P OUTPUT ACCEPT  </div><div class="line"># 允许接入的请求</div><div class="line">iptables -P INPUT ACCEPT</div><div class="line">iptables -P OUTPUT ACCEPT</div><div class="line">iptables -P FORWARD ACCEPT</div><div class="line">iptables -A INPUT -i lo -j ACCEPT</div><div class="line">iptables -A INPUT -i $IFACE_LAN -m state --state RELATED,ESTABLISHED -j ACCEPT</div><div class="line">iptables -A INPUT -i $IFACE_LAN -s 10.15.62.0/24 -j ACCEPT</div><div class="line">iptables -A INPUT -m iprange --src-range 10.15.82.50-10.15.82.100 -j ACCEPT</div><div class="line"># 限定转发的请求</div><div class="line">iptables -t nat -A POSTROUTING -m iprange --src-range 10.15.82.50-10.15.82.52 -o $IFACE_WAN -j MASQUERADE</div><div class="line">iptables -t nat -A POSTROUTING -m iprange --src-range 10.15.82.54-10.15.82.100 -o $IFACE_WAN -j MASQUERADE</div><div class="line">iptables -t nat -A POSTROUTING -s 10.15.62.29 -o $IFACE_WAN -j MASQUERADE</div><div class="line">iptables -t nat -A POSTROUTING -s 10.15.62.32 -o $IFACE_WAN -j MASQUERADE</div><div class="line">iptables -t nat -A POSTROUTING -s 10.15.62.205 -o $IFACE_WAN -j MASQUERADE</div><div class="line"># 将配置导出，注意更改对应的文件路径</div><div class="line">iptables-save &gt; /home/zju/firewall/iptables-rules</div></pre></td></tr></table></figure>
<ul>
<li>【注意设置为自启动网关服务器】，编辑 /etc/network/interfaces 添加em1下面内容自加载iptables配置，以及添加路由</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div></pre></td><td class="code"><pre><div class="line">auto em1</div><div class="line">...</div><div class="line">up route add -net 10.0.0.0 netmask 255.0.0.0 gw 10.15.82.1 dev em1</div><div class="line">up route add -net 222.205.46.0 netmask 255.255.254.0 gw 10.15.82.1 dev em1</div><div class="line">up route add -net 222.205.48.0 netmask 255.255.248.0 gw  10.15.82.1 dev em1</div><div class="line">up route add -net 222.205.56.0 netmask 255.255.252.0 gw 10.15.82.1 dev em1</div><div class="line">up route add -net 58.206.0.0 netmask 255.255.0.0 gw 10.15.82.1 dev em1</div><div class="line">up route add -net 222.205.123.0 netmask 255.255.255.0 gw 10.15.82.1 dev em1</div><div class="line">pre-up iptables-restore &lt; /home/zheda/firewall/iptables-rules</div><div class="line">post-down iptables-save &gt; /home/zheda/firewall/iptables-rules</div></pre></td></tr></table></figure>
<h2 id="其他服务器使用网关服务器连接外网"><a href="#其他服务器使用网关服务器连接外网" class="headerlink" title="其他服务器使用网关服务器连接外网"></a>其他服务器使用网关服务器连接外网</h2><ul>
<li>其他服务器配置自己的网络设置，gateway修改为网关服务器即可。修改/etc/network/interfaces，部分信息如下。</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div></pre></td><td class="code"><pre><div class="line">auto lo</div><div class="line">iface lo inet loopback</div><div class="line"></div><div class="line">auto em1</div><div class="line">iface em1 inet static</div><div class="line">address 10.15.82.67</div><div class="line">gateway 10.15.82.63</div><div class="line">netmask 255.255.255.0</div><div class="line">network 10.15.82.0</div><div class="line">broadcast 10.15.82.255</div><div class="line"></div><div class="line">dns-nameservers 10.10.0.21</div></pre></td></tr></table></figure>

      
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